# Posts by leah

Total # Posts: 503

**chemistry**

a certain solution contains 0.35 mol of HCl in 1200 mL of water. What is the pH of the solution?

**Math**

(4y + 5) /2 = y + 9? Can you please help me solve this?

**maths**

Chris wants to put a concrete path and a fence around his rectangular garden. The concrete path will be 1 meter wide and the fence will go around the edge of the path. The garden itself measures 5meter by 8 meters. A) calculate the perimeter of thr fence. B)Calculate the area ...

**math**

A music store offers a prize to a computer who can guess the closest, the number of jelly beans that fill a litre jar on the counter. Estimate the number of jelly beans in the jar if 1 jelly bean is approximately 2cm long (h) by 1.5cm in diameter(d)

**Math**

Space C has a base of 20 feet and a height of 24 feet and the two sides are both 26 feet (it is a parrallogram).... Space c will be tiled and used for an eating area. Each tile measures 1 square foot and cost $2. How much will it cost to tile the floor?

**Math**

You want to estimate the mean amount spent by customers at a local gas station with 98% confidence and a margin of error of no more than $2. Preliminary data suggests that the standard dev. is $5.1 is a reasonable estimate for the standard dev. for all customers. How large a ...

**Physics-Please help-Thank you!!**

Thank you so much-that's what I was doing wrong

**Physics-Please help**

Could someone remind me how to calculate this on the TI-84 Calculator: Which buttons do I hit for this: 3 * 10^8/5.4 * 10^14 I'm inputting it and coming up with 5.55 E 21 It should come out to be 5.55 *10^-7 but I'm not doing the input correct Please help

**Physics nd the TI84 Calculator**

Could someone remind me how to calculate this on the TI-84 Calculator: Which buttons do I hit for this: 3 * 10^8/5.4 * 10^14 I'm inputting it and coming up with 5.55 E 21 It should come out to be 5.55 *10^-7 but I'm not doing the input correct Please help

**Physics help on the TI-84 calculator**

Could someone remind me how to calculate this on the TI-84 Calculator: Which buttons do I hit for this: 3 * 10^8/5.4 * 10^14 I'm inputting it and coming up with 5.55 E 21 It should come out to be 5.55 *10^-7 but I'm not doing the input correct Please help

**Physics (76)**

none

**Physics**

Gind the force between charges of +10.o uC and -50.0 uC located 20.0 cm apart

**math**

how many times must the number 5 be subtracted to find the quotient of 5/5?

**Please help! (Calculus)**

Solve initial value problem explicitly: 1. y'= ye^-x, y(0)=1 2. y'= 5xe^-y, y(1)=1

**Math**

Are the differential equations separable or not? 1. y'= ye^(x+y) 2. y'= ye^(xy) 3. y'= y(xcos(y)) If they are, could you show how? Any help, even on one, would be extremely appreciated!

**geometry**

Two circles of equal radius intersect each other such that each circle passes through the center of the other circle. Find the equation for the perimeter of this figure.

**Physics**

A 5.0g silver spoon at 20.0C is placed in a cup of coffee at 90.0C. How much heat does the spoon absorb from the coffee to reach a temperature of 89.0C?

**Physics**

A 5.0g silver spoon at 20.0C is placed in a cup of coffee at 90.0C. How much heat does the spoon absorb from the coffee to reach a temperature of 89.0C?

**Pre-Algebra Math**

A bank teller is counting his money and notices that he has an equal number of tens and twenties. He also had $147 in other bills. If the total value of the bills he has is $1,167, how many tens and twenties does he have What would be the equation in algebra?

**adult education**

Why does the chosen developmental theorist appeal to you? Relate the chosen theory to a recent or upcoming developmental stage or phase in your own life.

**math**

what is 7 16th plus 3 8th please help me i am hopeless

**please help me, physics**

Five moles of a monatomic ideal gas expand adiabatically, and its temperature decreases from 410 to 200 K. (a) What is the work done by (or done to) the gas? Include the algebraic sign. J (b) What is the change in the internal energy of the gas? Include the algebraic sign. J

**physics**

would it be .55 converted to g times cg of aluminum which according to the link is .90 time the differnece in T which is 660-180

**Math**

A triangle with two congruent sides and two angles that both mesuare 45 is a. scalence and right b. isosceles and acute c. isosceles and right d.equilateral and acute

**Biology**

a) How do CO2 and O2 levels in the blood regulate breathing movements? b) Explain how these mechanisms are a good example of homeostasis. Help me please :(

**Chemistry**

What is the chemical symbol for bromine vapour?

**Physics - help please!**

A 20 kg mass is at rest on a level surface where the coefficient of static friction is 0.68. a) How much force will it take to get the mass to move. b) If a horizontal applied force of 72 Newtons is acting on the mass, how much friction is acting?

**Chemistry**

Explain why the calculated value for the (1) enthalpy of combustion for propane using bond energies (bond breaking and bond formation)might not be in close agreement to the values calculated using (2) Hess Law and the values calculated using the (3) summation of the change in ...

**Chemistry**

For Carbon dioxide, for a volume of 500 mL and temperature of 100 degrees celcius, calculate the pressures using the ideal gas law and the van der Waals equation. Explain any dicrepancies in the calculated values. Ideal Gas Equation: Van Der Waals Equation Pressure: Explanation:

**AP Chemistry**

Which response includes all of the following LiOH, KOH, Ni(OH)2, Mg(OH)2, Ca(OH)2 that are insoluble bases, and no others?

**physics**

A 50 kg boy picks up a 11 kg stereo and raises it 0.75 m from the floor to a tabletop. How much work did he do on the stereo? How much work did he do to raise his own center of mass 0.40 m in the process? I'm assuming you use W=mgy equation but do you consider the weight ...

**4th grade english**

Stories

**Science**

What weather would it be when: A. a cold front is moving into an area that has warm, moist air. B. A warm front is moving into an area that has cold, dense air. C. A cool sea breeze is blowing inland, causing warm, humid air to rise. D. Air pressure is falling and the ...

**Chemistry 1**

I have trouble understanding ratios and relativity so I can't understand how to use atomic mass units. Here is an example from my book: How many grams of iron would contain the same number of iron atoms as the number of carbon atoms contained in 1.000 g of carbon? Solution...

**Verb Tense**

As I further my education, I am securring my future Net Worth. Is future the verb? Is this correct?

**Chemistry**

The heat of fusion for water is 80cal/g. The specific heat of liquid water is 1.00cal/g. How many calories of heat are released when 20g of water at 30 degrees is cooled to 0 degrees and frozen to ice at 0 degrees?

**physics**

A car with a mass of 1435 kg moves at 11 m/s. What braking force is needed to bring the car to a halt in 10 s?

**Math**

I'm doing homework and stuck on this question: What percent of 3 1/3 is 3?

**English**

On the 6 one, say this: She recommended THAT I should read the book.

**physics**

The charges of two identical aluminum speheres are -24uC and +4.0uC. The spheres are brought together so they simultaneously touch each other. They then separated and placed on the X-axis. What is the net force exerted b one sphere on another after seperation?

**math**

i sorry...i meant to say kristen has 58 cousins... subtract 10 from 68 then make sure the total adds to 68. Disregard first response

**math**

kristen has 28 cousins. Subtract 10 from 58. just make sure that the total adds to 68

**calculus**

yes it is. Thank you very much for your help.

**calculus**

let f(x)=x+2/x+8. what does f^-1(-4) equal?

**calculus**

let f(x)=x+2/x+8. what does f^-1(-4) equal?

**Physics**

A particle of mass m0 is given a kinetic energy equal to one-third its rest-mass energy. How fast must the particle be traveling

**calculus**

what is the antiderivative of f(x)= x^4-2 sq root(X) +3/x^3

**Spanish**

how would you answer this question with affirmative commands and a direst object pronoun? Leo el libro de la historia de Oaxaca? Visito los museos? Compro la chaqueta? Escribo cartes? Compro el video sobre Monte Alban?

**Spanish**

I need to create a sentence to tell the following people's opinions. Tu / que / es aburrido(a) Yo / Que / es emocionante Nosotros/ que / es important para la ciudad. Los maetros/ que / es interesante Mi amigo(a) / que / es divertido(a)

**Accounting**

I need help with this problem. Could someone possibly explain to me how to prepare the journal entry for this problem? Prepare journal entries to record each of the following purchases transactions of a merchandising company. Show supporting calculations and assume a perpetual...

**Art**

I'm trying to find out what the differences and similarities are between: Impressionism Neoclassicism and Abstract Expressionism Examples of these arts are: The Emperor Napoleon in His Study at the Tuileries by Jacques Louis David (Impressionism) The Luncheon of the ...

**Social Studies**

What is a small island off the coast of Syria in the Mediterranean Sea?

**English**

Yes, that is true.

**English**

ok i got all of them except for 5. b. 11. d. 14. c. 15. a. 16. c. 18. c. 19. b. 20. d. 23. b. can you also check these answers please =]

**English**

5.a 6.c 11.a 12.b 14.a 15.c 16.d 17.b 18.a 19c 20.a 21.b 22.d 23c 24.a 25.b 26.d 27.c 28.d 29.c 30.a can u check these answers

**English**

5. Sarita's party takes place at night and all the villagers are gathered there. How do these details help make the party a good setting for the stranger to accomplish his goal? (1 point) * He can arrive and escape without people seeing him. * It will take longer for the ...

**computer**

Can you explain step by step how data is processed in the computer

**French**

I have to write the sentence "You (plural) need to make up your own mind" in french using "il faut que" and "prendre tes propres decisions." Would the result be "Il faut que vous prenniez tes propres decisions"?

**Physics**

If a bobsled with a total mass of 250kg, reaches the bottom of the hill at a speed of 92mph, how tall was the hill? I do not understand how to create the formula. I know that 92mph = 134.933 ft per second & that 1 mile = 5280 ft. Would I take the (92)mph x (5280) ft per mile...

**Physics**

If a bobsled with a total mass of 250kg, reaches the bottom of the hill at a speed of 92mph, how tall was the hill?

**biology**

why aren’t there vaccines for every disease?

**chemistry**

) Mare is preparing an experiment using 3 cups, one made of paper, one of plastic and one of glass. She plans on pouring 50 ml of hot water from a pitcher into each of the 3 cups and record the temperature in 5 minute intervals. What is the independent variable in this ...

**chemistry**

Mare is preparing an experiment using 3 cups, one made of paper, one of plastic and one of glass. She plans on pouring 50 ml of hot water from a pitcher into each of the 3 cups and record the temperature in 5 minute intervals. What is the independent variable in this ...

**physics**

Hans uses a wheelchair. Although he has a rampto in his house, he finds it difficult to get his wheelchair up the ramp. Whcih modification would make it easier for Hans to get in his house? a. increase the length of the ramp b. increase the friction between the wheels and the ...

**spanish**

Here is my translation -------------------------------- Let's just say I am talking of Madrid There where the roads are crossed where the sea cannot be conceived where returns always the fugitive …Let's just say I am talking of Madrid. Where the desire travels in ...

**spanish**

What is the meaning of this lyrics? I have translated this but I do not understand what he is talking about. The lyric meanings are abstract to me. Please help me! Pongamos que hablo de Madrid Allá donde se cruzan los caminos donde el mar no se puede concebir donde ...

**grammar**

B is the best choice.

**MLA english question**

My professor told that I can pick what to use. If you are doing in-text citations then you don't need footnotes and vice versa.

**computer**

All in one computer security system is good because it makes it easier to manage everything. You know that all of the antivirus,antispyware, and firewall will not conflict with one another because they made by the same company. All in one security system protects computers ...

**Calculus (for Business)**

Could you please show me the math behind answer a? How did you calculate the limit to get infinity?

**Calculus (for Business)**

Suppose a fish swimming a distance of L ft at a speed of v fit/sec relative to the water against a current flowing at the rate of u ft/sec (u<v) expends a total energy given by E(v)= (aLv^3)/(v-u) Where E is measured in foot-pounds and a is a constant. a) Evaluate the limit...

**history**

Dwight David Eisenhower

**math**

The area of a rectangle= LengthxWidth let x= the length of one side of the square garden A(x)= (x+3)(x-3)

**mental health**

i need to provide an example of how my own values and beliefs impact on my work with individuals experiencing mental illness

**Physics**

The mass of a car is 2400 kg. the constant power supplied by the engine is 60 kW and the car starts from rest. What is the speed of the car at the end of 2 seconds?

**math**

The mean systolic blood pressure of adult males is normally distributed with a mean of 138 (millimeters of mercury) and a standard deviation of 9.7. What percent of adult males have blood pressure between 161.28 and 164.9?

**math**

my daughter needs help finding a mystery number. 1)when the mystery number is divided by 3,there is a remainder of 1. but it has to be the same thing over again with 4 remainder 2 and 5 remainder 4.And there is one more what is the smallest number that could be divided by the ...

**College Math**

Thanks

**College Math**

Im having a hard time trying to figure out how to do this problem: A plane can fly 150 mph in calm air. Flying with the wind, the plane can fly 350 mi in the same amount of time it takes to fly 250 mi against the wind. Find the rate of the wind.

**Math**

Thanks. That's the answer i had and the a was in the radical. so do the answer come out to be 3(Radical 3a)

**Physics**

I tried solving this using by drawing it out, using trig and newton's laws to calculate Fx and Fy and used these values to calculate work in x-direction and y-direction. Finally I used Workx and Workx to find overall work with pythagoras....is this correct? I got 6.21J as ...

**Physics**

An object is placed on an inclined plane which forms an angle B = 18º with the horizontal. An external force F of magnitude 14.3 N is applied to the object. The force F acts in a direction which forms an angle A = 62º with the horizontal. As a result of the force F, ...

**Physics**

Yes I see what you're saying after drawing the diagram...So for the first bit we just use plain substitution of GPE formulas and second bit is trig. =) thanks that seemed easier than i thought.

**Physics**

A pendulum consists of an object of mass m = 1 kg swinging on a massless string of length l = 258 cm. The object has a speed of 1.6 m/s when it passes through its lowest point. What is the greatest angle with the vertical that the string makes during the motion of the object? ...

**calculus**

Thanks for your help. It helped me figure out the correct answer. The second derivative is 240x^3+360x^2-1800x. From there I factored and got 120x(2x^2+3x-15)=0. then used the quadratic formula to get (-3+sqrt129)/4, (-3-sqrt129)/4, and 0.

**calculus**

Consider the function f(x)=12x^5+30x^4–300x^3+2. f(x) has inflection points at (reading from left to right) x=D,E, and F. where D is___, E is____, and F is____.

**Math**

5 doller bills and 3 dimes

**Spanish**

Are you sure? I was thinking the first one is era because it describes a person.

**Spanish**

Hi, I was wondering if you would use "era" or "fue" in these sentences: La persona que se murió más recientemente era (fue?) una mujer. El deiciocho de agosto era (fue?) la fecha que ella fue al hospital. Thanks for the help!

**calculus**

The slope of the tangent line to the parabola y=4x2–6x+6 at the point where x=5 is: The equation of this tangent line can be written in the form y=mx+b where m is: and where b is:

**math**

have a good night mathmate.

**math**

yeah, I was messin up on that part, but now I have the same result as you. Thanks Mathmate. LoL

**math**

nevermind I got it, thanks.

**math**

this is what I did 56 567 *11.400 00.000 000.000 2626.800 56567.000 565670.000 which all =624863.800

**math**

I got 624863.800.

**math**

I am doing long multiplication and I need help. 56 567*11.400=

**Science (Grade 8)**

are you asking for their formulas?

**Medical Physics**

A 18000kg airplane lands with a speed of 77 m/s on a stationary aircraft carrier deck that is 115 m long. Find the work done by nonconservative forces in stopping the plane. I have an exam on this tomorrow and I am confused any help would be appreciated.

**Physics university**

ugh confused

**literary**

what is tone, mood, and irony?